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70 lines
2.1 KiB
70 lines
2.1 KiB
8 months ago
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.\" -*- tab-width: 4 -*-
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.\"
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.\" Copyright (c) 2004 Apple Computer, Inc. All Rights Reserved.
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.\"
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.\" Licensed under the Apache License, Version 2.0 (the "License");
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.\" you may not use this file except in compliance with the License.
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.\" You may obtain a copy of the License at
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.\"
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.\" http://www.apache.org/licenses/LICENSE-2.0
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.\"
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.\" Unless required by applicable law or agreed to in writing, software
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.\" distributed under the License is distributed on an "AS IS" BASIS,
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.\" WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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.\" See the License for the specific language governing permissions and
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.\" limitations under the License.
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.\"
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.Dd August 2004 \" Date
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.Dt dnsextd 8 \" Document Title
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.Os Darwin \" Operating System
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.\"
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.Sh NAME
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.Nm dnsextd
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.Nd BIND Extension Daemon \" Name Description for whatis database
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.\"
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.Sh SYNOPSIS
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.Nm
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.\"
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.Sh DESCRIPTION
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.Nm
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is a daemon invoked at boot time, running alongside BIND 9,
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to implement two EDNS0 extensions to the standard DNS protocol.
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.Pp
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.Nm
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allows clients to perform DNS Updates with an attached lease lifetime,
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so that if the client crashes or is disconnected from the network, its
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address records will be automatically deleted after the lease expires.
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.Pp
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.Nm
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allows clients to perform long-lived queries. Instead of rapidly polling
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the server to discover when information changes, long-lived queries
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enable a client to indicate its interest in some set of data, and then
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be notified asynchronously by the server whenever any of that data changes.
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.Pp
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.Nm
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has no user-specifiable command-line argument, and users should not run
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.Nm
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manually.
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.\"
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.Sh SEE ALSO
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.Xr mDNS 1
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.Xr mDNSResponder 8
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.Pp
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For information on Dynamic DNS Update, see RFC 2136
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"Dynamic Updates in the Domain Name System (DNS UPDATE)"
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.Pp
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For information on Dynamic DNS Update Leases, see
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.Pa http://files.dns-sd.org/draft-dns-update-leases.txt
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.Pp
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For information on Long-Lived Queries, see
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.Pa http://files.dns-sd.org/draft-dns-llq.txt
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.\"
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.Sh BUGS
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.Nm
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bugs are tracked in Apple Radar component "mDNSResponder".
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.\"
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.Sh HISTORY
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The
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.Nm
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daemon first appeared in Mac OS X 10.4 (Tiger).
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